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PROCEEDINGS of the 6TH FOSSIL RESOURCE CONFERENCE Edited by Vincent L 217 PROCEEDINGS OF THE 6TH FOSSIL RESOURCE CONFERENCE Edited by Vincent L. Santucci and Lindsay McClelland Edited by Vincent L. Santucci and Lindsay McClelland Technical Report NPS/NRGRD/GRDTR-01/01 Technical Report NPS/NRGRD/GRDTR-01/01 United States Department of the Interior•National Park Service•Geological Resource Division 218 Copies of this report are available from the editors. Geological Resources Division 12795 West Alameda Parkway Academy Place, Room 480 Lakewood, CO 80227 Please refer to: National Park Service D-2228 (September 2001). Cover Illustration Photo of Red Gulch Dinosaur Tracksite footprint (upper left); digital contour of track (upper right); Digital Terrain Model of track, planar view (lower left); and Digital Terrain Model of track, oblique view (lower right). 219 PROCEEDINGS OF THE 6TH FOSSIL RESOURCE CONFERENCE EDITED BY Vincent L. Santucci National Park Service PO Box 592 Kemmerer, WY 83101 AND Lindsay McClelland National Park Service Room 3223 - Main Interior 1849 C Street, N.W. Washington, DC 20240-0001 Geologic Resources Division Technical Report NPS/NRGRD/GRDTR-01/01 September 2001 178 AN INVENTORY OF PALEONTOLOGICAL RESOURCES FROM THE NATIONAL PARKS AND MONUMENTS IN COLORADO REBECCA SCOTT1, VINCENT L. SANTUCCI2, AND TIM CONNORS3 1Bodie State Historic Park, PO Box 515, Bridgeport, CA 93517; 2Fossil Butte National Monument, PO Box 592, Kemmerer, WY 83101; 3National Park Service, Geologic Resources Division, 12795 West Alameda Parkway, Academy Place, Room 480, Lakewood, CO 80227 ____________________ ABSTRACT—The National Park Service (NPS) currently administers eleven park units within the state of Colorado. Most of these parks and monuments have been established and are recognized for their significant geologic features. Two monuments in Colorado, Dinosaur National Monument and Florissant Fossil Beds National Monument, were specifically established for their significant paleontological resources. Fossiliferous rocks of Paleozoic, Mesozoic, and/or Cenozoic age have been identified in all of the National Park System units in Colorado. In 2000, the first comprehensive inventory of paleontological resources in the national parks and monuments of Colorado was initiated. A wide diversity of fossilized plants, invertebrates, vertebrates, and trace fossils has been documented. Paleontological resources identified from within the parks and monuments have been assessed for their scientific significance, potential threats, and management as non- renewable resources. Baseline paleontological resource data obtained during this survey will assist National Park Service staff with management of the paleontological resources and protection of fossils within their park. ____________________ PALEONTOLOGICAL RESOURCE monuments are also considered in this study in order to as- sess the potential for stratigraphically equivalent resources MANAGEMENT AND PROTECTION within park boundaries. Baseline paleontological resource he paleontological resources in the national parks and data will enable park staff to enhance the management, pro- monuments of Colorado provide valuable information tection, research and interpretation of park fossils. Tabout ancient plants and animals and their environ- Ongoing and future paleontological research in the vari- ment. Fossils are recognized as non-renewable resources that ous NPS units within the state of Colorado will expand our possess both scientific and educational values. The NPS man- knowledge of the fossil record and the ancient environments ages fossils along with other natural and cultural resources in which these organisms lived. for the benefit of the public. All fossils from NPS areas are protected under federal law and their collection is prohibited except under the terms of a research permit. BENT’S OLD FORT NATIONAL HISTORIC SITE Paleontological resources are exhibited in a number of Bent’s Old Fort National Historic Site (BEOL) was au- national parks and monuments in Colorado. The Quarry Visi- thorized on June 3, 1960 as a national historic site to pre- tor Center at Dinosaur National Monument provides visitors serve one of the important trading centers on the Sante Fe with the opportunity to view the world famous dinosaur bone- Trail. The site is one of the smaller NPS areas administered bearing rock wall as an in situ exhibit. Several thousand in Colorado. The fort is located on the flood plain of the macrofossils, representing 110 species, have been collected Arkansas River in the southeastern part of the state. from Mesa Verde National Park and there are excellent dis- Bedrock at Bent’s Old Fort consists of Cretaceous rocks plays of fossils at the park. Florissant Fossil Beds National identified as the Bridge Creek Member of the Greenhorn Monument has an in situ exhibit of giant petrified stumps, Limestone Formation. The Greenhorn is overlain by approxi- Sequoia affinis, along an interpretive trail. mately twelve feet (3.6 m) of Pleistocene (Wisconsinan) sands More comprehensive paleontological resource invento- and gravel deposited between 11,000 and 8,000 years ago. ries are underway in a number of the NPS units in Colorado. This unit is overlain with clayey sand that is also of Wiscon- These surveys are designed to identify the scope, significance, sin age (Moore, 1973). and distribution of the paleontological resources and to as- Twenty-eight specimens of the rudist Durania sess any natural or human-related threats to these ancient re- cornupastoris were collected from the Bridge Creek Member mains. Fossils reported from areas adjacent to the parks and of the Greenhorn Limestone just outside the park boundaries 23178 SCOTT ET AL.— PALEO INVENTORY OF NPS AREAS IN COLORADO 179 (Cobban et al., 1985). Rudists are an extinct group of bi- tiary volcanic eruptions covered the area with lava flows, valved (pelecypod) mollusks. The rudist-producing bed in breccias, and tuffaceous deposits including the West Elk Brec- the Bridge Creek Member extends into the national historic cia (Fig. 1). site; thus, the potential for this resource in the park also exists. COLORADO NATIONAL MONUMENT A fragmentary mammoth tusk was discovered at Bent’s Colorado National Monument (COLM) was established Old Fort by Jackson Moore, a NPS archeologist. Tusk frag- by presidential proclamation on May 24, 1911. The Monu- ments were collected by Jackson between 1963 and 1966. ment is located in the west-central portion of Colorado along The remains were found in a gravel bed overlying a white the eastern margin of the Colorado Plateau and preserves limestone unit at the historic site (Moore, 1973). The frag- scenic sheer-walled canyons and towering monoliths. ments have been tentatively identified as Mammothus columbi COLM contains rocks dating from the Precambrian to (personal communication, Nancy Russell, 2000). Accord- the Cretaceous. Basement rock consists of Precambrian schist ing to the park’s museum records, an additional three mam- and gneiss. During the Paleozoic, the area was uplifted form- moth tusk fragments were found in 1992 by archeologist Jerry ing the Uncompahgre Highlands. Precambrian rocks are Dawson. overlain by Mesozoic sedimentary units including, from old- est to youngest, the Chinle Formation, Wingate Sandstone BLACK CANYON OF THE and Kayenta Formation. The Triassic Chinle Formation is GUNNISON NATIONAL PARK the oldest sedimentary formation in the COLM and Black Canyon of the Gunnison (BLCA) was originally unconformably overlies Precambrian crystalline rocks, re- proclaimed a national monument on March 2, 1933, to pre- flecting a major unconformity. All of the sedimentary units serve a twelve mile stretch of river gorge carved by the in the park are Mesozoic. A theropod track site was discov- Gunnison River in west-central Colorado. The Monument ered in the Chinle Formation in 1990 (A. Hunt, personal com- was given wilderness designation on October 20, 1976 and munication, 1999). The Grallator-like track site is located was later redesignated as a national park on October 21, 1999. near the east entrance to the Monument. Hansen (1987) provides a comprehensive overview of Where the Kayenta has been removed; the Wingate Sand- the geology of Black Canyon of the Gunnison National Park. stone weathers into rounded domes and forms most of the Hansen (1971) published a geologic map, which includes named features within the Monument (Dubiel, 1992). The the national park. During 1999 and 2000, the National Park Entrada Sandstone of the Jurassic San Rafael Group is usu- Service Geologic Resources Division produced a digital geo- ally salmon colored and crossbedded: it is topped by the logic map for BLCA, compiling maps by Hansen, at 1:24,000 Wanakah. The Entrada Sandstone of Rattlesnake Canyon scale. has been referred to as the second largest concentration of The geologic setting of BLCA consists of a sequence of arches in the world and is of a different origin than the arches Precambrian rocks including arkosic sandstones, graywackes, at Arches National Park. The Morrison Formation overlies and granite (Hansen, 1967). Renewed crustal movement in the San Rafael Group and is fossiliferous. The Morrision the area accompanied the intrusion of the Vernal Mesa and Formation consists of the Tidwell, Salt Wash and the Brushy Curecanti plutons (Hansen, 1981). Most of the Paleozoic Basin Member (Turner and Fishman, 1991). The Jurassic section in the park has been eroded away before or during section is topped by the Cretaceous Burro Canyon Forma- the time of the Uncompahgre uplift. The
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